say that you need to eat more healthfully, you immediate to be physically active, but people live in environments where unhealthy stuff is readily available. it's cheap. it's heavily promoted. >> when talking about the issues of overweight and obesity in this country people point the fingers in lots of different directions, but here in philadelphia a lot of fingers get pointed in stores like this, the corner store, or the bodega. this is where they say battles can be lost and won. enter this nonprofit group, the food trust. >> corner stores, in philadelphia is this the frontline? >> this is the frontline. children were receiving the majority of their calories every single day at corner stores like this. >> reporter: to the tune of some 700 calorie az day, according to one study. that's more than a point a week. lehman and her team approached local store owners and helped them to start replacing some junk products with healthier options. >> before you had those types of foods here, what were the kids eating? what would they buy after school? >> chips and soda. cakes. >> cakes. >> yeah. >> a lot of